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排序方式: 共有82条查询结果,搜索用时 15 毫秒
1.
K. DAHLBORN J. HOSSAINI-HILALI S. BENLAMLIH B. E. KARLBERG 《Acta physiologica (Oxford, England)》1992,144(4):485-486
Human muscle samples were obtained with the percutaneous biopsy technique. The samples were membrane-hyperpermeabilized (skinned) using a chemical or freeze-drying technique. Short single fibre segments were dissected from the sample, transferred to an experimental chamber, connected to a force transducer and manipulator, and exposed to temperature-controlled solutions. The force generating-capacity, the sensitivity of the contractile apparatus to calcium and the caffeine threshold for calcium release from the sarcoplasmic reticulum could be studied in the short muscle fibre segments obtained from man with the percutaneous muscle biopsy technique. The average length of the fibre segments between the connectors was 0.44±0.21 mm. Thus, detailed studies of the contractile machinery can be made on human skinned muscle fibres with only minimal discomfort to the patient or subject during biopsy, which should be useful in studies of neuromuscular disease, muscle plasticity or in applied physiology. 相似文献
2.
Vivian Delcourt Patrice Garcia Benjamin Chabot Benoit Loup Pierre Remy Marie‐Agns Popot Ludovic Bailly‐Chouriberry 《Drug testing and analysis》2020,12(6):763-770
Recombinant human erythropoietin (rHuEPO) belongs to the therapeutic class of erythropoiesis stimulating agents (ESAs) due to its implication in the creation pathway of red blood cells and thus enhancement of oxygenation. Because of this bioactivity, rHuEPO has been considered as a major doping agent in sports competitions for decades. Over the years, doping control laboratories designed several analytical strategies applied to human and animal samples to highlight any misuse. Even though multiple analytical approaches have been reported, none has yet been dedicated to racing camels. Here, we describe an analytical strategy to test camel plasma samples at screening using an ELISA assay and a targeted nano‐liquid chromatography–high‐resolution tandem mass spectrometry for confirmatory analysis. The method was validated and has been successfully applied to post‐race samples, allowing the detection of a positive case of rHuEPO administration. 相似文献
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4.
目的:研究新疆北部双峰驼细粒棘球绦虫的发育与形态特征。方法:用棘球蚴原头节感染家犬,观察成虫在犬体内的发育。对35d成虫进行形态学的观察和描述。结果:用原头节感染的6只家犬,在感染后35d和45d用槟榔碱驱虫,每只犬驱出成虫14780至135900条。35d的成虫中有10%虫体已含有厚壳虫卵,表明有感染性。77%的成熟体节位于虫体末端,最多体节数为3。虫体总长2.5±0.7mm,成虫平均顶突钩数32.7±1.2,外形光滑。平均睾丸数32.4±3.9,分布于整个成熟体节,在卵黄腺后排成一排。卵巢明显较长,有不明显的分叶,卵黄腺长形并掩盖梅氏腺。结论:新疆北部双峰驼细粒棘球绦虫在形态学上与北非骆驼株细粒棘球绦虫相似,可能是分布在我国的细粒棘球绦虫骆驼株。但与骆驼株亦有不同之处,应进一步鉴定。 相似文献
5.
Patrick C.Y. Woo Susanna K.P. Lau Ulrich Wernery Emily Y.M. Wong Alan K.L. Tsang Bobby Johnson Cyril C.Y. Yip Candy C.Y. Lau Saritha Sivakumar Jian-Piao Cai Rachel Y.Y. Fan Kwok-Hung Chan Ringu Mareena Kwok-Yung Yuen 《Emerging infectious diseases》2014,20(4):560-572
In 2013, a novel betacoronavirus was identified in fecal samples from dromedaries in Dubai, United Arab Emirates. Antibodies against the recombinant nucleocapsid protein of the virus, which we named dromedary camel coronavirus (DcCoV) UAE-HKU23, were detected in 52% of 59 dromedary serum samples tested. In an analysis of 3 complete DcCoV UAE-HKU23 genomes, we identified the virus as a betacoronavirus in lineage A1. The DcCoV UAE-HKU23 genome has G+C contents; a general preference for G/C in the third position of codons; a cleavage site for spike protein; and a membrane protein of similar length to that of other betacoronavirus A1 members, to which DcCoV UAE-HKU23 is phylogenetically closely related. Along with this coronavirus, viruses of at least 8 other families have been found to infect camels. Because camels have a close association with humans, continuous surveillance should be conducted to understand the potential for virus emergence in camels and for virus transmission to humans. 相似文献
6.
GSH-responsive curcumin/doxorubicin encapsulated Bactrian camel serum albumin nanocomposites with synergistic effect against lung cancer cells 下载免费PDF全文
Yu Xinyu Xieripu Adilijiang Xu Qilan Zulipikaer Azhati Song Yiyan Cai Ling Chen Jin 《生物医学研究杂志》2020,34(1):54-66
The aim of this study was to prepare camel serum albumin (CSA) nanoparticles using a self-assembly strategy to co-immobilize curcumin (CCM) and doxorubicin (Dox) which was in favor of combined chemotherapy and biomedical applications of bactrian (Camelus bactrianus) CSA. The constructed CSA nanoparticles (CSA-NPs) with the size around 200 nm displayed a high degree of polydispersity and further encapsulation of CCM and Dox caused no apparent morphological changes to the nanocomposite (CCM/Dox CSA-NPs). The synergistic cytotoxic effect of CCM and Dox on cancer cell A549 was observed with the calculated combination index less than 1.0. Moreover, the release kinetic profile of encapsulated drugs showed a concentration dependence of glutathione (GSH) originating from the GSH used in nanoparticle formation to break the intramolecular disulfide bonds. In vitro cytotoxicity evaluations also revealed that CCM/Dox CSA-NPs showed higher cytotoxicity than that of single drug loaded CSA-NPs, which was also validated by high content screen assay. Taken together, the CCM/Dox CSA-NPs with redox-responsive attributes provided an integrated protein-based combinational drug-delivery matrix to exert synergistic effects. 相似文献
7.
Suess O Magerkurth O Da Silva C Brock M Pietilä TA 《Journal of pediatric surgery》2004,39(10):e11-e13
Small children are predisposed for animal bite wounds in the craniofacial region, because the likelihood of sustaining trunk and extremity injuries increases with height. The clinical picture of animal bite wounds is highly variable. Depending on the dental anatomy of the biting animal, such wounds may range from sharp stitch wounds to extensive lacerations with or without tissue loss. The ears and nose are injured most often because of their exposed location. Nevertheless, depressed skull fractures with injury to the dura and to the brain parenchyma are extremely rare. This case presentation describes the rare case of a craniocerebral camel bite wound (Lackmann stage IV B) in a 3-year-old girl that required immediate neurosurgical management. The neurosurgical management, choice of antibiotic, postoperative treatment, and clinical course are discussed, and background information on camel bite injuries is given. 相似文献
8.
Saleh M. Al-Hussain Mustafa S. Yousuf Ayat Bani Hani Sami Zaqout Laiche Djouhri Ayman G. Mustafa 《Anatomical record (Hoboken, N.J. : 2007)》2022,305(5):1264-1276
Neurons in the cerebellar cortex of camels were studied using modified Golgi impregnation methods. Neurons were classified according to their position, morphology of their soma, density and distribution of dendrites, and the course of their axons. Accordingly, eight types of neurons were identified. Three types were found in the molecular layer: upper and lower stellate cells and basket cells, and four types were found in the granular layer: granule cells, Golgi Type II cells, Lugaro cells, and unipolar brush cells. Only the somata of Purkinje cells were found in the Purkinje cell layer. The molecular layer is characterized by the presence of more dendrites, dendritic spines, and transverse fibers. Golgi cells also show extensive dendritic branching and spines. The results illustrate the neuronal features of the camel cerebellum as a large mammal living in harsh environmental conditions. These findings should contribute to advancing our understanding of species-comparative anatomy in achieving better coordination of motor activity. 相似文献
9.
Requirements for trace minerals in camels, particularly selenium, are not well-known. Selenium supplementation using a pharmaceutical form or commercial mineral mixture is common practice in camels to address the cardiomyopathy often attributed to selenium deficiency. This supplementation is often empirical and based on estimated needs for cattle. Nowadays the use of selenium in animal foodstuffs is commonplace and further investigation of its metabolism (ingestion, dynamic of storage-destocking, excretion) in camels is warranted. The present review aimed to synthesize all the experimental research (comparative selenium status in cow and camel, response to different levels of supplementation at different physiological stages, excretion maternal transfer, experimental toxicosis) and field observations (deficiency, supplementation practices) undertaken in camels. The results underline the particularity of the unique metabolic profile of the camel and lead to practical recommendations for supplementation in camels, highlighting its relative sensitivity to excess Se intake at lower levels than in cattle. The maximal tolerable dose is 8 mg and the recommended doses range from 2 to 4 mg. 相似文献
10.
Camel Urine Promotes Sensitization to Doxorubicin by Inhibiting Epithelial-Mesenchymal Transition and Modulating NF-κB-Snail Signaling Pathway in Breast Cancer Cells 下载免费PDF全文
Mashael Saqer Al-MutairiIbtehal Kamal MatarSuad AlfadliAwated Al-Mutairi 《Asian Pacific journal of cancer prevention》2021,22(12):4017-4029
Background: Camel urine (CU) has been used as traditional treatment in the Arabian Peninsula for centuries. Although, researchers have reported CU anti-cancer effects, the exact mechanism(s) of action involved has not been fully elucidated. The epithelial–mesenchymal transition EMT is a phenotypic switch that promotes the acquisition of a fibroblastoid-like morphology by epithelial tumor cells, resulting in enhanced tumor cell motility and invasiveness. EMT has been shown to contribute to metastasis and chemoresistance of carcinomas. For that, in the present study, we have assessed the potential mechanism (s) by which CU exert its anti-cancer effects and its possible synergistic therapeutic effect with Doxorubicin (DOX) in breast cancer cells. Methods: Determination of anti-proliferative and apoptosis validation of CU was performed by 3-(4,5-Dimethylthiazol-2-yl)-2,5,-diphenyltetrazolium bromide (MTT), annexin-V-fluorescein isothiocyanate assays, and Western blot. EMT protein markers, migration and invasion of cells were determined by Western blot or immunofluorescent staining, Scratch assay, Transwell invasion assay, respectively. Results: CU applied a significant anti-cancer effect on breast cancer cells via induction of DNA damage and apoptosis in a concentration- and time-dependent manner. Also, CU remarkably reversed the EMT by downregulating N-cadherin and Vimentin expression and upregulating E-cadherin expression. As a result, the stemness, migration and invasion of breast cancer cells were also inhibited, which was likely mediated by NF-κB-Snail signalling pathway and its downstream inflammatory effectors. CU successfully enhanced DOX cytotoxicity by reversing EMT which possibly through inhibition of NF-κB-Snail signalling and subsequently inflammation. Thus, our study provides new mechanistic bases for the therapeutic application of CU that may improve the outcomes of anti-cancer chemotherapy. 相似文献